In a high-ceilinged hangar at CERN, six rival experiments are racing to understand the nature of one of the Universe's most elusive materials. They sit just metres apart. In places, they are literally on top of one another: the metallic beam of one criss-crosses another like a shopping-centre escalator, its multitonne concrete support hanging ominously overhead.
“We're constantly reminded of each other,” says physicist Michael Doser, who leads AEGIS, an experiment that is vying to be the first to discover how antimatter — matter's rare mirror image — responds to gravity.
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